CT motion artifact correction using pixel-specific back-projection

To reduce artifacts caused by respiratory motion in chest CT scans, an algorithm called pixel-specific back-projection (PSBP) has been developed. PSBP is an approximate filtered back-projection algorithm that corrects for in-plane motion by performing the reconstruction using a coordinate system that is specific to each pixel. The coordinate systems move according to the in-plane motion in the slice at the time the projection was acquired. PSBP reduced artifacts caused by motion in both simulated and patient scan data.